Ncert- class 6- science-Chapter 11: Air Around Us 1 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 1 1. Air is regarded as a mixture because: its pressure may vary its temperature may change its volume changes under different conditions its composition may vary None 2. Carbon exists in the atmosphere in the form of: carbon monoxide in traces and carbon dioxide carbon dioxide only carbon monoxide only coal None 3. A greenhouse gas that absorbs energy and maintains earth's temperature is: carbon dioxide argon nitrogen oxygen None 4. Air has________ composition with________ oxygen at high attitudes. variable, less variable, more fixed, more fixed, less None 5. The correct ascending order of gases as per their composition in air is: oxygen < carbon dioxide < hydrogen oxygen < carbon dioxide < nitrogen hydrogen < oxygen < nitrogen nitrogen < hydrogen < oxygen None 6. What is the major constituent of air Nitrogen Hydrogen Oxygen Water vapour None 7. Glass panes usually appear hazy because: it is the property of transparent substances they are old. water vapour settling on the tiny dust particles. None None 8. What process replenishes the atmosphere with oxygen? Both A and C Oxygen Cycle Photosynthesis Water Cycle None 9. __________ is the most abundant gas in the atmosphere. Oxygen Nitrogen Carbon dioxide None of the above None 10. The percentage of nitrogen and oxygen in air is: 37% by weight 50% by weight 99% by volume 21% by volume None 11. Which is the most abundant gas in our atmosphere ? Oxygen Nitrogen Carbon dioxide Carbon monoxide None 12. Combustion can not take place without: zinc Air water carbon None 13. Choose the option which justifies the given statement:-Air is considered a mixture, not a compound. It is possible to separate air into its constituent gases by physical methods like fractional distillation. Air does not have a fixed formula like compounds. All of the above Air shows properties same as the constituent gases present in it. None 14. Which of the following gases burns in air Carbon monoxide Helium Carbon dioxide Nitrogen None 15. Which of the following gases do not form part of the atmosphere? Nitrogen Oxygen Chlorine Carbon idoxide None 16. Which of these statements are true about air?(i) Air is a mixture of several types of gases.(ii) Air exerts pressure.(iii) The composition of air is constant in the atmosphere. (i), (ii) and (iii) (ii) and (iii) (i) and (iii) (i) and (ii) None 17. It is not proper to breathe through our mouth because: more carbon dioxide will be inhaled the dust particles would enter our bodies we will catch cold easily our throat will become sore None 18. Which one of the following gas does not form a part of the atmosphere? Carbon dioxide Chlorine Nitrogen Oxygen None 19. Carbon dioxide constitutes nearly ___ % of the atmosphere. 28 45 78 0.03 None 20. John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make? Air occupies space Air has mass Air is matter Air is a gas. None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
